Work driver for lathes



Feb. 6, 1923.

A. BOOME. WORK DRIVER FOR LATHES.

FILED NOV. 15, 9.20.

049. finome. a3 JQ JZZZW Patented Feb. 1%23.

UNED stares parent ica- ALEXANDER 300MB}, OF CHICAGO, ILLINOIS.

WORK DRIVER FOR. LATHES.

Application filed November 15, 1920. Serial No. 424,008.

To all whom it/mag/ concern: erably provided through an equalizing plate Be it known that I, ALEXANDER BOOME, 01' frame as illustrated in the drawing.

a citizen of the United States, residing at This plate '6 is preferably in the form of a Chicago, in the county of Cook and State of square fram as illustrated andv is provided 5 Illinois, have invented certain new and useat diametrically opposite corners thereof 60 ful Improvements in Work Drivers for with channels 7 and 8 forming guideways Lathes, of which the following is a specififor floatingly supporting the work drivingv cation. dog as will hereinafter appear. This frame' This invention relates to work-driving 6 is mounted on the face plate by meansof lathe dogs and particularly to such a dog a pair of bolts 9 secured in the face plate at 65 adapted to be floatingly mounted on a lathe diametrically opposite sides ofthe axis face plate and to automatically grip the thereof and having blocks. 10 thereon accliwork when the face plate is rotated. rately slidingly fitting the channel 7 in the In turning heavy work, such ascar wheels frame 6. A cover plate 11 fits overeach and axles, it is well known that considerable bolt 9 and is engaged by a spring 12 held 70 driving power is required, which power ac'tunder compression thereagainst by means of .ing through the dog and its jaws to the work nuts 13. A pin 14 in the frame engages a necessitates the use of a dog having the slot in each plate 11 to prevent the plate maximum strength and rigidity as well as from rotating. The spring 12 serves to hold one providing the greatest convenience and the frame frictionally against the face plate 75 efficiency in operation. It is accordingly the to normally prevent sliding movement of the Y;

' primary object of this invention to provide frame thereon. i 1

a driving dog of the above type embodying The work driving dog 15 has mounted these improved features. therein at diametrically opposite sides there- More specifically, it is an object of the inof a pair of bolts 16 each having an end -80 vention to provide a work-driving dog with thereof formed into a ball adapted to be a plurality of work-engaging jaws mounted received in a socketof a two-partbloclif 17 therein in a most substantially and secure s lidably mounted in the channels 8of} the manner whereby the reactive thrust of work frame, the two parts of the block beii'igse on the jaws is transferred directly to the dog cured together by means of a pair of-pins '85 in a manner substantially as though the jaws 18. It will now be seen that through .the and dog were a one piece element. channel connections at .7 and 8 the dog is- Further and more specific objects of the floatingly mounted on the face plate'in such": invention will become apparent from the a manner that'it will readily adjust itself to v following specification taken in connection the w'ork W at all times. s v

with the accompanying drawing wherein: As heretoforestated, one purposeflofthis.

Figure 1 is a perspective view of an axle invention is to provide a more substantial lathe mbodying my invention. and secure mounting for the work-engaging Fig. 2 is a front elevation of the lathe jaws within the driving dog. As illustrated 40 .face plate and the work-driving dog mountin the drawing, the dog is provided inte- 95 r ported on the'ce'nters 4 and 5. S111C6 v therein. Such mounting 0 ed thereon. .riorly thereof with a plurality of guideways' Fig. 3 is a sectional view of the same taken 19 arranged eccentrically aroundthe cen-' on the line 3-3 of Fig. 2. tra1 axis of the dog, two diametrlcally o -'i y Fig. 4 is a sectional view of the same taken posite guide-ways beinglillustrated; A worf f 45 on the line 4 -4 of Fig. 2. engaging jaw 20 provided with a lurahtygwreo Referring in detail to the drawing, 1 illusof work-gripping teeth) as 2 11.15 adaptedt0 trates the face plate of the lathe driven from be mounted-on each; guideway to engagewt the motor 2 through the face plate driving .work as illustrated, in Fig. .2. As will gear '3. The work'W is adaptedto-besup. noted, each jaw 20 has itsrear face direct v t e in con-tact throughout its'jentire surface'wit work is supportedfand held .in 11 alignthe interior surface of the dog, a to'r'rgue' and ment on thecenters, the driving dog must groove connection 22-being, preferablyproi be mounted in a manner to' readily adjust vided to hold each jaw properly o iti dx itself to he rk n p213; irregularitfy']; centrally within the do The width of dog is'pre H eachjaw is preferably su stantially offllp the dog whereby the jaws at no place pro-- ject beyond the plane of either face of the dog. To permit the releasing of the jaws from engagement with the work, I provide a gear segment 23 on the dog adapted to be engaged by the teeth 24 of a wrench 25 adapted to fit over a pin or lug 26 on one of the jaws.

In operation the work is first placed through the dog 15 and mounted on the centers 4' and 5. The jaws 20 are then placed in position within the dog on the lower parts of the guideways and slid along the guideways, which being eccentric, soon move the teeth 21 into engagement with the work. The power is now turned on the machine and as the face plate 6 and dog 15 rotate in the direction of the arrow (Fig. 2), the dog is first moved relative to the jaws 20, due to the resistance of rotation offered by the work. When the resistance has been overcome the jaws have automatically become firmly engaged with the work and the greater the resistance offered by the work the greater will be the tightening grip of the jaws on the work. In releasin the jaws from Work-engaging position, t e wrench 25 is engaged with the lug 26 on one of the jaws and turned in the direction indicated by the arrow in Fig. 2 whereby the jaw is moved down its eccentric guideway and out of engagement with the work. Since the jaw is tightly engaged with. the work the first movement of the wrench will operate to move both jaws and the work relative to the dog. Through this operation both jaws are moved down their eccentric guideways and are thereby released from engagement with the work and may, be removed from within the dog.

hat I claim is:

1. In a lathe, the combination of a face plate, a work-driving dog fioatingly mounted thereon, the dog being provided internally with a plurality of eccentrically disposed guideways, a plurality of work-driving aws mounted in the dog with their rear faces bearing against the guideways, and means for releasing the jaws from the work.

2. In a lathe, the combination of a face plate, a work-driving dog fioatingly mounted thereon, the dog being provided internally with two diametrically opposite eccentrically disposed guideways, and a work-driving jaw comprising a plurality of detachable workengaging teeth thereon mounted on each guideway with the rear face thereof bearing against the guideway.

3. In a lathe, the combination of a face plate, a work-driving dog fioatingly mounted thereon, the dog being provided internally with a plurality of eccentrically disposed guideways, and a plurality of workdriving aws mounted in the dog with their rear faces bearing against the guideways,

each jaw and its respective guideways being magma provided with a tongue and groove connection for holding the jaw centrally disposed within the dog.

4. In a lathe, the combination of a face plate, an equalizing plate mounted on the face plate for sliding movement thereon in either direction in a. straight line diametri cally of the'face plate, a work-driving dog mounted on the equalizing plate for sliding movement thereon in either direction in a straight line diametrically of the face plate at right angles to the sliding movement of the equalizing plate. the dog being provided internally with a plurality of eccentrically disposed guideways, a plurality of workdriving jaws mounted in the dog with their rear faces bearin against the guideways, and means for sliding one of the jaws along its guideway,

5. In a lathe, the combination of a face plate, a. work-driving dog fioatingly mount ed thereon, the dog being provided internally with a plurality of eccentrically disposed guideways, a plurality of work-driv-' ing aws mounted in the dog with their rear faces bearing against the guideways, the construction being such that the jaws will automatically grip the work when the face plate is rotated, and wrench-engaging means between one of the jaws and the dog for releasing the grip of the jaws on the work.

6. In a lathe, the combination of a face plate, a work-driving dog floating mounted thereon, the dog being provided internally with a plurality of eccentrically disposed guideways, a plurality of work-driving jaws mounted in the dog with their rear faces: bearing against the guideways, the construction being such that the aws will automatically grip the work when the face plate is rotated, and means comprising a gear sector on the dog and a lug on one of the jaws adapted to be engaged by a wrench for releasing the grip of the aws on the work.

7. In a lathe, the combination of a face plate, a work-driving dog floatingly mounted thereon, the dog being provided internally with a plurality of eccentrically disposed guideways, and a plurality of removable work-driving jaws loosely mounted in the dog with their rear faces bearing against the guideways, the construction being such that the jaws are placed in work-driving position within the dog after the work has been positioned therein.

8. In a lathe, the combination of a face plate, a work-driving dog floatingly mounted thereon, the dog being provided internally with a plurality of eccentrically disposed guideways, and a plurality of work-driving jaws mounted in the dog with their rear faces bearing against the guideways, the body of each jaw being within the face planes of the dog. I

9. In a lathe, the combination of a face plate, a Work-driving dog floatin 1y mO-unt- Width of the dog and each jaw being so ed thereon, the dog being provide? internally mounted Within the dog that the face planes with a plurality of, eccentrically disposed of each jaw and those of thedog substan- 10 guideways, and a plurality of work-driving tially coincide.

5 jaws mounted in the dog With their-rear In testimony whereof, I hereto afiix my faces hearing against the guideways, the signature.

Width of each jaw being substantially the ALEXANDER BOOME. 

